maltese with rash possible fungal infection

I have a 4yr. old maltese who has had a rash on her stomach and inner back legs for several months. I had taken her to the vet when it started she thought it was a fungal infection and had given her a steriod injection and malaseb shampoo. The rash continues and she is constantly licking her stomach and the inside of her legs. It starts as a white pustule then pops and forms a skin circle barely noticable not crusty at all, her whole belly is red. She is not a typical maltese, she does not have alot of hair and in general her skin is mildly pink. She is up to date with all her vaccines. I feed her parina dog food since she was a puppy before rash started. She also licks her paws and anus. I cant afford to keep taking her to the vet for this problem. Should i try benadryl for some relief, she weighs 10lbs. Any help would be appreciated. Thanks Mary Beth

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